How do you say its a sunny day in french?

There are a few ways to say "It's a sunny day" in French, depending on the level of formality and emphasis:

Formal:

* Il fait un beau soleil. (Literally: "It makes a beautiful sun.") This is the most common and formal way to say it.

* Le soleil brille. (The sun shines.)

Informal:

* Il fait beau. (It's nice weather.) This is a more general way to say it, but implies good weather including sunshine.

* Y'a du soleil. (There's sun.) This is a very informal way to say it, commonly used among friends.

Other options:

* C'est une journée ensoleillée. (It's a sunny day.) This is a more literal translation, but less common in everyday speech.

The best option for you will depend on the context and your level of French.